下面四个选项中，哪一项能由右边给定的图形的规律演变而成（）
A.选项A
B.选项B
C.选项C
D.选项D
参考答案：C
The people in this country went through a period in their life________they had no freedom to use the
cellphone.[ ]
A. where
B. when
C. what
D. that
住宅结构的设计使用年限不应少于多少年？
